Particle injection and acceleration at earth's bow shock - Comparison of upstream and downstream events

Details Particle injection and acceleration at earth's bow shock - Comparison of upstream and downstream events Particle injection and acceleration at earth's bow shock - Comparison of upstream and downstream events

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..376e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 376-394.

Astronomy and Astrophysics

Astrophysics

145

Bow Waves, Earth (Planet), Particle Acceleration, Shock Wave Interaction, Solar Terrestrial Interactions, Solar Wind, Energy Spectra, Interplanetary Magnetic Fields, Ion Scattering, Monte Carlo Method, Thermal Plasmas

Scientific paper

The injection and acceleration of thermal solar wind ions at the quasi-parallel earth's bow shock during radial interplanetary magnetic field conditions is investigated. Active Magnetospheric Particle Tracer Explorers/Ion Release Module satellite observations of complete proton spectra, and of heavy ion spectra above 10 keV/Q, made on September 12, 1984 near the nose of the shock, are presented and compared to the predictions of a Monte Carlo shock simulation which includes diffusive shock acceleration. It is found that the spectral observations are in good agreement with the predictions of the simulation when it is assumed that all accelerated ions originate in the solar wind and are injected into the acceleration mechanism by thermal leakage from the downstream plasma. The efficiency, which is determined directly from the downstream observations, is high, with at least 15 percent of the solar wind energy flux going into accelerated particles. The comparisons allow constraints to be placed on the rigidity dependence of the scattering mean free path and suggest that the upstream solar wind must be slowed substantially by backstreaming accelerated ions prior to undergoing a sharp transition in the viscous subshock.

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